//
// The LLVM Compiler Infrastructure
//
-// This file was developed by the LLVM research group and is distributed under
-// the University of Illinois Open Source License. See LICENSE.TXT for details.
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// [0, 0) = {} = Empty set
// [255, 255) = {0..255} = Full Set
//
-// Note that ConstantRange always keeps unsigned values.
+// Note that ConstantRange can be used to represent either signed or
+// unsigned ranges.
+//
//===----------------------------------------------------------------------===//
#ifndef LLVM_SUPPORT_CONSTANT_RANGE_H
#define LLVM_SUPPORT_CONSTANT_RANGE_H
#include "llvm/ADT/APInt.h"
-#include "llvm/Support/DataTypes.h"
-#include "llvm/Support/Streams.h"
-#include <iosfwd>
+#include "llvm/System/DataTypes.h"
namespace llvm {
-class Constant;
-class Type;
+/// ConstantRange - This class represents an range of values.
+///
class ConstantRange {
APInt Lower, Upper;
static ConstantRange intersect1Wrapped(const ConstantRange &LHS,
- const ConstantRange &RHS, bool sign);
- public:
- /// Initialize a full (the default) or empty set for the specified type.
+ const ConstantRange &RHS);
+
+public:
+ /// Initialize a full (the default) or empty set for the specified bit width.
///
- ConstantRange(const Type *Ty, bool isFullSet = true);
+ explicit ConstantRange(uint32_t BitWidth, bool isFullSet = true);
/// Initialize a range to hold the single specified value.
///
/// assert out if the two APInt's are not the same bit width.
ConstantRange(const APInt& Lower, const APInt& Upper);
- /// Initialize a set of values that all satisfy the predicate with C. The
- /// predicate should be either an ICmpInst::Predicate or FCmpInst::Predicate
- /// value.
- /// @brief Get a range for a relation with a constant integral.
- ConstantRange(unsigned short predicate, const APInt &C);
+ /// makeICmpRegion - Produce the smallest range that contains all values that
+ /// might satisfy the comparison specified by Pred when compared to any value
+ /// contained within Other.
+ ///
+ /// Solves for range X in 'for all x in X, there exists a y in Y such that
+ /// icmp op x, y is true'. Every value that might make the comparison true
+ /// is included in the resulting range.
+ static ConstantRange makeICmpRegion(unsigned Pred,
+ const ConstantRange &Other);
/// getLower - Return the lower value for this range...
///
/// getUpper - Return the upper value for this range...
///
- const APInt &getUpper() const { return Upper; }
+ const APInt &getUpper() const { return Upper; }
- /// getType - Return the LLVM data type of this range.
+ /// getBitWidth - get the bit width of this ConstantRange
///
- const Type *getType() const;
+ uint32_t getBitWidth() const { return Lower.getBitWidth(); }
/// isFullSet - Return true if this set contains all of the elements possible
/// for this data-type
/// isWrappedSet - Return true if this set wraps around the top of the range,
/// for example: [100, 8)
///
- bool isWrappedSet(bool isSigned) const;
+ bool isWrappedSet() const;
/// contains - Return true if the specified value is in the set.
- /// The isSigned parameter indicates whether the comparisons should be
- /// performed as if the values are signed or not.
///
- bool contains(const APInt &Val, bool isSigned) const;
+ bool contains(const APInt &Val) const;
+
+ /// contains - Return true if the other range is a subset of this one.
+ ///
+ bool contains(const ConstantRange &CR) const;
/// getSingleElement - If this set contains a single element, return it,
/// otherwise return null.
///
APInt getSetSize() const;
+ /// getUnsignedMax - Return the largest unsigned value contained in the
+ /// ConstantRange.
+ ///
+ APInt getUnsignedMax() const;
+
+ /// getUnsignedMin - Return the smallest unsigned value contained in the
+ /// ConstantRange.
+ ///
+ APInt getUnsignedMin() const;
+
+ /// getSignedMax - Return the largest signed value contained in the
+ /// ConstantRange.
+ ///
+ APInt getSignedMax() const;
+
+ /// getSignedMin - Return the smallest signed value contained in the
+ /// ConstantRange.
+ ///
+ APInt getSignedMin() const;
+
/// operator== - Return true if this range is equal to another range.
///
bool operator==(const ConstantRange &CR) const {
ConstantRange subtract(const APInt &CI) const;
/// intersectWith - Return the range that results from the intersection of
- /// this range with another range. The resultant range is pruned as much as
- /// possible, but there may be cases where elements are included that are in
- /// one of the sets but not the other. For example: [100, 8) intersect [3,
- /// 120) yields [3, 120)
+ /// this range with another range. The resultant range is guaranteed to
+ /// include all elements contained in both input ranges, and to have the
+ /// smallest possible set size that does so. Because there may be two
+ /// intersections with the same set size, A.intersectWith(B) might not
+ /// be equal to B.intersectWith(A).
///
- ConstantRange intersectWith(const ConstantRange &CR, bool isSigned) const;
+ ConstantRange intersectWith(const ConstantRange &CR) const;
/// unionWith - Return the range that results from the union of this range
/// with another range. The resultant range is guaranteed to include the
/// [12,15) is [3, 15), which includes 9, 10, and 11, which were not included
/// in either set before.
///
- ConstantRange unionWith(const ConstantRange &CR, bool isSigned) const;
+ ConstantRange unionWith(const ConstantRange &CR) const;
/// zeroExtend - Return a new range in the specified integer type, which must
/// be strictly larger than the current type. The returned range will
/// correspond to the possible range of values if the source range had been
- /// zero extended.
- ConstantRange zeroExtend(const Type *Ty) const;
+ /// zero extended to BitWidth.
+ ConstantRange zeroExtend(uint32_t BitWidth) const;
+
+ /// signExtend - Return a new range in the specified integer type, which must
+ /// be strictly larger than the current type. The returned range will
+ /// correspond to the possible range of values if the source range had been
+ /// sign extended to BitWidth.
+ ConstantRange signExtend(uint32_t BitWidth) const;
/// truncate - Return a new range in the specified integer type, which must be
/// strictly smaller than the current type. The returned range will
/// correspond to the possible range of values if the source range had been
/// truncated to the specified type.
- ConstantRange truncate(const Type *Ty) const;
+ ConstantRange truncate(uint32_t BitWidth) const;
+
+ /// zextOrTrunc - make this range have the bit width given by \p BitWidth. The
+ /// value is zero extended, truncated, or left alone to make it that width.
+ ConstantRange zextOrTrunc(uint32_t BitWidth) const;
+
+ /// sextOrTrunc - make this range have the bit width given by \p BitWidth. The
+ /// value is sign extended, truncated, or left alone to make it that width.
+ ConstantRange sextOrTrunc(uint32_t BitWidth) const;
+
+ /// add - Return a new range representing the possible values resulting
+ /// from an addition of a value in this range and a value in Other.
+ ConstantRange add(const ConstantRange &Other) const;
+
+ /// multiply - Return a new range representing the possible values resulting
+ /// from a multiplication of a value in this range and a value in Other.
+ /// TODO: This isn't fully implemented yet.
+ ConstantRange multiply(const ConstantRange &Other) const;
+
+ /// smax - Return a new range representing the possible values resulting
+ /// from a signed maximum of a value in this range and a value in Other.
+ ConstantRange smax(const ConstantRange &Other) const;
+
+ /// umax - Return a new range representing the possible values resulting
+ /// from an unsigned maximum of a value in this range and a value in Other.
+ ConstantRange umax(const ConstantRange &Other) const;
+
+ /// udiv - Return a new range representing the possible values resulting
+ /// from an unsigned division of a value in this range and a value in Other.
+ /// TODO: This isn't fully implemented yet.
+ ConstantRange udiv(const ConstantRange &Other) const;
+
+ /// shl - Return a new range representing the possible values resulting
+ /// from a left shift of a value in this range by the Amount value.
+ ConstantRange shl(const ConstantRange &Amount) const;
+
+ /// ashr - Return a new range representing the possible values resulting from
+ /// an arithmetic right shift of a value in this range by the Amount value.
+ ConstantRange ashr(const ConstantRange &Amount) const;
+
+ /// shr - Return a new range representing the possible values resulting
+ /// from a logical right shift of a value in this range by the Amount value.
+ ConstantRange lshr(const ConstantRange &Amount) const;
/// print - Print out the bounds to a stream...
///
- void print(std::ostream &OS) const;
- void print(std::ostream *OS) const { if (OS) print(*OS); }
+ void print(raw_ostream &OS) const;
/// dump - Allow printing from a debugger easily...
///
void dump() const;
};
-inline std::ostream &operator<<(std::ostream &OS, const ConstantRange &CR) {
+inline raw_ostream &operator<<(raw_ostream &OS, const ConstantRange &CR) {
CR.print(OS);
return OS;
}
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